Thunder Bay, Ontario, Canada Climate Change Severity

62
Very High
The current climate change severity in Thunder Bay is Very High, with a 19.8% worsening in the climate score compared to last 16 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Jul. (Historical Vs 2026) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Thunder Bay Weather Condition Changes (Historic Vs 2026)

2026
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2026

Over the past 16 year(s), Thunder Bay temperature has changed by around +65.3%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
2769
155.5%
cloudyCloudy
5615
-73.2%
rainyRainy
6039
-35%
snowySnowy
1221
75%
mistyMisty
113
1200%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 16 years, Thunder Bay has experienced measurable shifts in key climate parameters, contributing to the current severity score of 62 (within the Very High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

62/100

Very High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2026, Thunder Bay experienced significant changes:

Temperature change of

+1.31 °C

Variation in annual rainfall

+35.02 %

Change in average humidity

-8.74 %

PM2.5 levels surged by

+22.72 %

Heatwave changed by

-4 Days

Coldwave changed by

-8 Days

Wind speeds changed by

-0.6 km/h

These indicators show a dramatic increase in volatility and worsening conditions. Thunder Bay's Very High severity status requires urgent and immediate adaptation and mitigation strategies, particularly focused on managing extreme weather events, improving air quality, and ensuring water resources are adequate for the population.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jul.

Thunder Bay Weather Forecast 30 Days (August - September 2026)
Thunder Bay, Ontario, Canada

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Fri. 7, Aug.
sunnySunny
Temperature Icon23°/15°
Humidity Icon69%
Wind Icon14.8km/h
Sat. 8, Aug.
sunnySunny
Temperature Icon23°/12°
Humidity Icon61%
Wind Icon15.8km/h
Sun. 9, Aug.
sunnySunny
Temperature Icon22°/10°
Humidity Icon66%
Wind Icon14.4km/h
Mon. 10, Aug.
sunnySunny
Temperature Icon21°/11°
Humidity Icon67%
Wind Icon9.4km/h
Tue. 11, Aug.
sunnySunny
Temperature Icon21°/10°
Humidity Icon64%
Wind Icon11.9km/h
Wed. 12, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon20°/11°
Humidity Icon69%
Wind Icon24.5km/h
Thu. 13, Aug.
partly cloudyPartly Cloudy
Temperature Icon22°/7°
Humidity Icon65%
Wind Icon20.5km/h
Fri. 14, Aug.
moderate rain at timesRain
Temperature Icon22°/14°
Humidity Icon74%
Wind Icon14.4km/h
Sat. 15, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/14°
Humidity Icon77%
Wind Icon17km/h
Sun. 16, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon22°/15°
Humidity Icon75%
Wind Icon18.9km/h
Mon. 17, Aug.
heavy rain at timesHeavy Rain
Temperature Icon21°/14°
Humidity Icon72%
Wind Icon18.6km/h
Tue. 18, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/14°
Humidity Icon75%
Wind Icon17.5km/h
Wed. 19, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon22°/14°
Humidity Icon77%
Wind Icon15.8km/h
Thu. 20, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/14°
Humidity Icon82%
Wind Icon17.1km/h
Fri. 21, Aug.
heavy rain at timesHeavy Rain
Temperature Icon21°/13°
Humidity Icon74%
Wind Icon17.4km/h
Sat. 22, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/13°
Humidity Icon74%
Wind Icon15.9km/h
Sun. 23, Aug.
heavy rain at timesHeavy Rain
Temperature Icon22°/14°
Humidity Icon77%
Wind Icon17.8km/h
Mon. 24, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/14°
Humidity Icon79%
Wind Icon17.4km/h
Tue. 25, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/14°
Humidity Icon76%
Wind Icon18.6km/h
Wed. 26, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon16.6km/h
Thu. 27, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/13°
Humidity Icon79%
Wind Icon17.5km/h
Fri. 28, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon20°/13°
Humidity Icon80%
Wind Icon16.7km/h
Sat. 29, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/13°
Humidity Icon81%
Wind Icon18.7km/h
Sun. 30, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon22°/14°
Humidity Icon76%
Wind Icon18.7km/h
Mon. 31, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/14°
Humidity Icon75%
Wind Icon17.9km/h
Tue. 1, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon18.1km/h
Wed. 2, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon21°/13°
Humidity Icon75%
Wind Icon18.4km/h
Thu. 3, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon21°/12°
Humidity Icon77%
Wind Icon19.6km/h
Fri. 4, Sep.
heavy rain at timesHeavy Rain
Temperature Icon19°/12°
Humidity Icon76%
Wind Icon19.3km/h
Sat. 5, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon18°/11°
Humidity Icon76%
Wind Icon18.4km/h
Sun. 6, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon19°/11°
Humidity Icon76%
Wind Icon18.8km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onFri. 7, Aug.

23°C

Low will be onThu. 13, Aug.

7°C

HumidityHumidity

High will be onThu. 20, Aug.

82%

Low will be onSat. 8, Aug.

61%

Wind SpeedWind Speed

High will be onWed. 12, Aug.

24.5km/h

Low will be onMon. 10, Aug.

9.4km/h

PrecipitationPrecipitation

High will be onFri. 7, Aug.

7.7mm

Low will be onMon. 10, Aug.

0.01mm

Ultraviolet IndexUV

High will be onSun. 9, Aug.

6.6

Low will be onFri. 4, Sep.

3

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